Electrically-heated device.



J. F. LAMB.- ELEGTRICALLY HEATED DEVICE.

APPLLU A'DIOH FILED 11110.19, 1912 1 60,268, Patented Apr. 29, 1913.

WITNESSES INVENTOR i r I JQSGPHFI La'mb:

A'ITORN EY it's most successful embodiment in utensils UNITED STATES ,raarurur OFFICE.

Josnrn 1*; LAMB, or ivnw B ITAIN, CONNECTICUT, ASSIGNOR 'ro Laurens, Fann &

, CLARK, or mew 331mm, CONNECTICUT, A CQRPORATION or CONNECTICUT.

ELEornIcALLY-nnurin nnvron,

Tooll whom itmay concern itknown that I, J0sE-PH F. LAMB, a citizen of the United States,- and a resident of New Britain, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in ElecQ trically-Heated Devices, of which the following is a specification.

' This improvement consists. in combining with a utensil and an electric heater a plate .of conducting material in such relation that the heat imparted to the plate by-the heater causes it to expand into binding en age- 1 ment with the utensil. The .plate is titted,

in heat conducting relation to. the utensil, and its expansion tends to perfect or make more efiectual this heat conducting relation.

I consider it to be essential to the proper working of my invention that those walls of the utensil which receive and tend to resist the expansion of the conducting plate be so fdisposed that the heat is rapidly absorbed by whatever is being heated, thus keeping the'temperature of these walls lower than that of the conducting plate, with the result that the the bin mg engagement and heat-conducting relation with these walls of the utensil. In fact, this invention finds having socketed walls within which the heater and'theconducting plate are located, it being thus surrounded on top and circumferential1y by the heat-absorbing material, which keeps its temperature relatively lower than that. of the conducting plate.

.So far asI know the present practice is to mechanically clamp the heater to the utensil in one way. or another to obtain a heating relation, the expansion or distortion of the heater or its partsduring the o ration of'the device tending to destroy t 's heating relation, rather than to improve it'or make it more efi'ectual. v. a It is the object of this invention to improve upon such constructions in the manner pointed out above. Two embodiments of the invention have been selected for illustration, though it is to be understood that it is susce tible of various uses and in connection wit' many different utensils or like devices.

In the drawings Figure 1,15 a sectional v.155 view of one embodiment. 2 is a sec- Specification of Lette'rs Patent. Application filed December 19, 1912. Serial No. 737,670.

in process of manufacture, as well as may be eaten'expansion of the plate creates perfects the? the utensil.

Patented Apr. 29, 1913'.

'tional view of another embodiment. Figs.

3 and 4 are views on enlarged scale, showing the operation in some exaggeration' Fig. 5 shows a modification in which a plurality of units are used.

In the structure illustrated, ,the part denoted by amay be'considered{,as a portion of the utensil, b the heater, and (1 a plate of 7 heat conducting material located between one side of the heater andthe wall of the utensil and in heating relation withboth, this plate taking heat from the heater and delivering it to the utensil.

Figs. 3 and 4 show in exaggeration the peculiar and novel arrangement of the parts, and particularly of the plate with reference to the utensil wall, which produces the result of causing theplate, as it expands under heat, to bind its'elt against the walls of the utensil and thus improve the heat conducting relation over what is customarily provided in the manufacture of the device.

.Itlwill be noted that the practice of this invention requires that the plate 0 be located between opposing walls of the utensil, which may conveniently be, and as illustrated are, the side walls of sockets or indentationsin \Vhile it may be preferred to secure the heater and conducting plate 0 in place by as'sing screws or likedevices through them 1nto the utensil wall, any means for holding these parts in position, such as the slight otisets cl, cl, will suffice, the point to be noted being that these are positioning means and not necessarily clamping devices to hold the heater against the utensil wall. VVhen' the device is in operation the binding of the plate 0 against the walls of the utensil holds the heater in proper position.

In Fig. 1 the heater is shown against awall of the utensil, and the plate 0 between the exposed side of the heater and the-opposing walls of the utensil. This arrangement is particularly.advantageous since heat from the exposed side of the heater is conducted to the utensil over a suitable path, and as the edges of the plate are cooler than its central portion, owing to the fact that heat is being absorbed therefrom by the utensil, the heat will flow to its edges in an attempt to equalize the temperature. Thus, the greater part of the heat evolved is utilized, and loss by ineffective dissipation correspondingly reduced.

In Fig. 2 the plate 0 is shown as interposed I heater direct 'to the: utensil.

In Fig. 5'two heaters b" and b are shown in'a socket in the wall of the utensil, and one I plate of heat conducting material 0' is interposed between the two heaters, and a second plate c is arranged against the exposed side of the lower heater. These plates'are fitted closely within the socket so that their edges are in heat conducting relation therewith, and are caused to expand by the heat evolved, to make this heat conducting relation more effectuaL It will be observed that in all of the embodiments of the invention here illustrated,

the heater is practically surrounded by the material or substance which is to be heated, and that in each case the exposed surface of the'heater has arranged in heating relation with it a plate of conducting material whose edges are in heating relation with the part to be heated, and that it is the function of this plate toprovide a path for the flow of heat in' a direction anclto apoint where it will perform effective work. t

7 Having described my invention in' the manner in which it is to be utilized in con-.

. 'nection with the embodiments illustrated, it

will be apparent to any one skilled in the art how it can be incorporated in other utensils to accomplish the desired results.

I desire it to be clearly understood that 'the embodiments illustrated have been selected merely for convenience and simplicity in the descrlption and disclosure of the invention,and not with the intentionof limiting the scope of the invention asset forth in the appended claims;

I claim as my invention:

-' 1. That improvement in electrically heated devices which comprises the combination with a utensil and an electrical heater formed on a core ofinsulating material, of a plate of heat conducting vmaterial 'formed separately therefrom and arranged betweenone side of the heater and a wallof the utenbeing so fitted to said wall as to produce by its expansion under heat evolved by-the heater, binding engagement therewith, whereby the heat conducting relation between. the said parts ismade more etl'ectual.

ranged in heating relation with the heater,

and opposing integral surfaces of the utensil between which said member is fitted, said surfaces being adapted to receive pressure createdj'by the expansion'pf said member whenit is heated and tending to resist that j pressure, thereby creating and maintaining more effectual heat conducting relation be tween said member and the utensil duringv the operation of the device.

' 3. The combination witha utensil and an' electrical heater therefor formed on a core said plate being confined. in the direction of of insulating material, of a plate ofx'heat conducting material formed separately from .80

the heater and in heating relation with both,

its greatest expansion between parts-of the utensil wall, and normally ha-Vinga close fit therein, butada'pted to expand under the heat evolved in the heater into binding engagement therewith, tocreate and maintain a more effectual heat conduct-ing relatlon.

4. The comblnatlon wlth a receptacle hav ing a socket in its wall, of an electrical heater located within said socket in heating relation with a wall of the'receptacle and a plate of heat conducting material located within the socket against the exposed sur-' ,face of the heater and with its edges in heat conducting relation -with the side walls of? the socket." v i 5. The combination with a receptacle having a wall indented to form-an outwardly-' opening socket, of an electrical heater locatedin said socket inheating relation with the end thereofiand a plate of heat conduct-. ing material located. within said socket against the exposed side of said heater, closving the mouth of said socket, and with its edges in heat conducting relation with the e side walls of the socket.

6. The combination with a receptaclehaving a' wall indented to form anoutwardly;

opening socket, of a pair of electricalheaters' located inthe socket, one abovetheother, a

plate of heat conducting material located bctween and in heating relation with both of.

said heaters and with its edge-in heat conducting relation with the side walls of the socket, and asecond plate of heat conductmg material located against the expo'sedsurface of one of said hea-tersand having its edge ar ranged in heat conducting relation with the side walls of said socket.

JOSEPH FLLAMB.

VVitnes'ses: p

JENN E C. ANnnRsoN,

LEROY H. PAGE. 

